25Nevertheless, in Case 244/80Foglia v Novello [1981] ECR 3045, paragraph 21, the Court considered that, in order to determine whether it has jurisdiction, it is a matter for the Court of Justice to examine the conditions in which the case has been referred to it by the national court. The spirit of cooperation which must prevail in the preliminary-ruling procedure requires the national court to have regard to the function entrusted to the Court of Justice, which is to assist in the administration of justice in the Member States and not to deliver advisory opinions on general or hypothetical questions {Foglia v Novello, cited above, paragraphs 18 and 20, and Case 149/82Robarás v Insurance Officer [1983] ECR 171, paragraph 19).